Přednáška z Anatomie a fyziologie rostlin

datum 11.11.2014
přednáší Ing. Martin Janda (VŠCHT Praha, 2.cena za nejlepší přednášku na 11th International PhD Student Conference on Experimental Plant Biology, September 9-10, 2013, Košice)
název Magical mystery tour: Salicylic acid signalling
anotace Salicylic acid (SA) is a small phenolic compound. In plants, it is a key phytohormone that controls many physiological processes such as cell growth, respiration, stomatal aperture, senescence, seed germination, seedling development and thermo-tolerance. SA has a role in plant responses to many abiotic stresses such as chilling, heat, heavy metal toxicity, drought, osmotic stress and salinity. In the last twenty years, great attention has been paid to its role in plant defence against pathogen attack. SA role in plant-defence should be the “cornerstone” topic of this lecture.

The synthesis of SA is one of the crucial ways a plant reacts to a biotic attack. SA is involved in both local and systemic resistance. The best described mode of action of SA is due to the change of NPR1 (nonexpressor pathogenesis related 1) structure from oligomer to monomer. But the NPR1 independent pathway exists as well. Recently, new evidence has been provided concerning SA perception. Namely there was a long sought race to find SA receptor. The findings about NPR3 and NPR4 as receptors were big steps forward in this research.

In our laboratory we are interested in several topics which are “more or less” connected with SA. Mainly we are focused on the connection between SA and phospholipid signalling pathway. Recently we characterized an Arabidopsis SA-overaccumulating mutant impaired in phosphatidylinositol-4-kinases (pi4kIIIß1ß2). This mutant is dwarf. The crossing with mutants impaired in SA signalling revealed that pi4kIIIß1ß2 stunted rosette growth is dependent on SA. And we also suggested the involvement of phospholipase D in SA signalling pathway. Finally we proposed the connection between SA and actin cytoskeleton. Our “novel” findings and their consequences will be discussed in a second part of the lecture.

Janda M., Ruelland E.: Magical mystery tour: salicylic acid signalling. Environmental and Experimental Botany. (2014) DOI: 10.1016/j.envexpbot.2014.07.003 (in press)
materiály životopis přednášejícího